Water and sanitation issues of Bangladesh

Water and sanitation issues of Banglades

The Effects of Sintering Schedule to the Final Properties of Iron Powder Compacts Formed through Warm Compaction Route

Powder forming at above ambient temperature with admixed lubricant to obtain the high quality  green compacts is recently discovered, however the effects of sintering schedule to the mechanical properties and microstructures of final products are not explored yet. Therefore, a lab scale warm compaction rig is designed and fabricated to generate green compacts at different forming parameters. Iron ASC 100.29 is used as main powder constituent during this investigation. The defect-free green compacts were sintered in an argon gas fired furnace at different sintering schedule. The mechanical properties and microstructures of sintered parts were evaluated. The results revealed that the mechanical properties and microstructures of sintered products are affected by the forming temperature and sintering schedule. Therefore, the suitable forming temperature and sintering schedule are identified for the production of high quality components

An Experimental Investigation on the Effects of Forming Temperature and Sintering Schedule to the Final Characteristics of Fe92Cu7.5Al0.5 Powder Compacts

This paper presents the development of FeCuAl powder compacts through warm compaction process. A lab-scale uni-axial die compaction rig was designed and fabricated which enabled the powder forming at elevated temperature. Iron powder ASC 100.29 was mechanically mixed with other elemental powders, i.e., copper (Cu), and aluminium (Al) for 30 minutes at a rotation of 30 rpm. Green compacts were then generated by forming the prepared feedstock at 30ºC (room temperature), 150ºC, and 200ºC through simultaneous upward and downward axial loadings of 325 MPa. The defect-free green compacts were subsequently sintered in argon gas fired furnace at 800ºC for three different holding times, i.e., 30, 60, and 90 minutes at three different rates, i.e., 5, 10, and 15ºC/min. The final products were characterized for their physical, electrical, and mechanical properties and their microstructures were evaluated. The results revealed that the suitable forming temperature is 150ºC, holding time is 30 minute, and sintering rate is 10ºC/min

Reattachment of fractured anterior tooth fragment: An approach in endo esthetic view

Esthetic rehabilitation of crown fractured anterior teeth is one of the greatest challenges to the dental specialists in concern of long-term biological function. Traditional views demonstrate limitations with much controversy in MICD (Minimally invasive cosmetic dentistry) concept. To meet the challenge a new biological approach in endo esthetic view is considered. This case report represents the management of a fractured right maxillary central incisor tooth of 27 year-old-male patient where his own fractured tooth fragment restored by reattachment technique. The clinical examination revealed complicated crown fracture extended horizontally from mesial to distal and angulated incisally from palatal to labial with pulp exposure. The fracture was not evident labially. In this case, the procedure was used to repair the fracture tooth fragment included root canal treatment and glass fiber post for reinforcement. The tooth fragment was luted with light activated flowable composite resin.  Onward assessment showed a stable reattachment, good esthetic and function with healthy periodontium.

Mechanical and Thermal Analysis of Classical Functionally Graded Coated Beam

The governing equation of a classical rectangular coated beam made of two layers subjected to thermal and uniformly distributed mechanical loads are derived by using the principle of virtual displacements and based on Euler-Bernoulli deformation beam theory (EBT). The aim of this paper was to analyze the static behavior of clamped-clamped thin coated beam under thermo-mechanical load using MATLAB. Two models were considered for composite coated. The first model was consisting of ceramic layer as a coated and substrate which was metal (HC model). The second model was consisting of Functionally Graded Material (FGM) as a coated layer and metal substrate (FGC model). From the result it was apparent that the superiority of the FGC composite against conventional coated composite has been demonstrated. From the analysis, the stress level throughout the thickness at the interface of the coated beam for the FGC was reduced. Yet, the deflection in return was observed to increase. Therefore, this could cater to various new engineering applications where warrant the utilization of material that has properties that are well-beyond the capabilities of the conventional or yesteryears materials. The Authors, published by EDP Sciences, 2018.Scopu

A 16-year-old boy with chronic discharging sinus on upper left lateral incisor tooth

This article has no abstract. The first 100 words appear below: A 16-year-old boy referred to our department with chronic discharging sinus during the course of root canal treatment on the upper left lateral incisor tooth from a private dental clinic. The patient had a history of trauma to the tooth 1 year back. On clinical examination, the coronal portion of the upper left lateral incisor tooth was found to have filled with temporary restorative material. The tooth was sensitive to palpation and percussion with the presence of a sinus tract. On vitality test, there was no response to heat and cold test

Effects of forming temperature and sintering rate to the final properties of FeCuAl powder compacts formed through uniaxial die compaction process

This paper presents the outcomes of an experimental investigation on the effects of forming temperature and sintering schedule to the final characteristics of FeCuAl powder mass formed at different temperature and sintered at different schedule. A lab-scale uni-axial die compaction rig was designed and fabricated which enabled the compaction of powder mass at room temperature as well as elevated temperature. Iron (Fe) powder ASC 100.29 was mechanically mixed with other elemental powders, namely copper (Cu), and aluminum (Al) for 60 minutes and compacted at three different temperature, i.e., 30°C, 150°C, and 200°C by applying 425 MPa of simultaneous downward and upward axial loading to generate green compacts. The as-pressed samples were inspected visually and the defect-free green compacts were subsequently sintered in an argon gas fired furnace at 800°C for 60 min at three different heating/cooling rates, i.e., 5, 10, and 15°C/min, respectively. The sintered samples were then characterised for their physical, electrical, and mechanical properties. The microstructures of the sintered samples were also analysed. The results revealed that a forming temperature of 150°C and a sintering rate of 10°C/min could produce a product with better characteristics